设计模式_命令模式-优快云博客

本文链接：https://blog.youkuaiyun.com/u010866487/article/details/21096109

本文介绍了一种常用的设计模式——命令模式，并通过具体的Java代码实现展示了如何使用该模式来组织不同的命令。通过创建抽象命令类及具体命令类如拥抱(Hug)和购物(Shopping)，结合发起者角色(Boy)和接收者角色(MM)来展示命令模式的应用。

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Command.java

package com.bjsxt.dp.command;

public abstract class Command {
	public abstract void execute();
	public abstract void unDo();
}

HugCommand.java

package com.bjsxt.dp.command;

public class HugCommand extends Command {

	@Override
	public void execute() {
		System.out.println("hug");
	}

	@Override
	public void unDo() {
		System.out.println("open your arms");
	}

}

ShoppingCommand.java

package com.bjsxt.dp.command;

public class ShoppingCommand extends Command {

	@Override
	public void execute() {
		System.out.println("zoo");
	}

	@Override
	public void unDo() {
		System.out.println("undo zoo");
	}

}

Boy.java

package com.bjsxt.dp.command;

import java.util.ArrayList;
import java.util.List;

public class Boy {
	private String name;
	private List<Command> commands = new ArrayList<Command>();

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	
	public void pursue(MM mm) {
	}

	public void doSomeThing() {
		
	}

	public void addCommand(Command c1) {
		this.commands.add(c1);
	}

	public void executeCommands() {
		for(Command c : commands) {
			c.execute();
		}
	}
	
	public void undoCommands() {
	 //	
	}
	
}

MM.java

package com.bjsxt.dp.command;

public class MM {
	private String name;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	
	public void order(Boy b) {
		Command c1 = new ShoppingCommand();
		b.addCommand(c1);
		Command c2 = new HugCommand();
		b.addCommand(c2);
		b.executeCommands();
	}
}